questions about the patch

i'm still running the orig game ver 1.0, once upon a time i had loaded the patch but it screwed my game so it wouldn't run anymore. took me a while to get the residue out of the registry so it would load proper again. is there a thread here or perhaps a link with info on what that patch is actually supposed to do and how to get it to run right? I think i might like to try some of the missions ya'll have made.